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rule win_protonbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.protonbot." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.protonbot" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 7444 83bdb8feffff10 8d8da4feffff 56 } // n = 4, score = 400 // 7444 | je 0x46 // 83bdb8feffff10 | cmp dword ptr [ebp - 0x148], 0x10 // 8d8da4feffff | lea ecx, [ebp - 0x15c] // 56 | push esi $sequence_1 = { 0f42ca 83fe10 51 0f43c7 8bcb 50 } // n = 6, score = 400 // 0f42ca | cmovb ecx, edx // 83fe10 | cmp esi, 0x10 // 51 | push ecx // 0f43c7 | cmovae eax, edi // 8bcb | mov ecx, ebx // 50 | push eax $sequence_2 = { c7461000000000 c746140f000000 c60600 833d????????10 b8???????? c745cc01000000 } // n = 6, score = 400 // c7461000000000 | mov dword ptr [esi + 0x10], 0 // c746140f000000 | mov dword ptr [esi + 0x14], 0xf // c60600 | mov byte ptr [esi], 0 // 833d????????10 | // b8???????? | // c745cc01000000 | mov dword ptr [ebp - 0x34], 1 $sequence_3 = { 6804010000 8d85ecfeffff c645fc02 50 6a00 ff15???????? 8d8decfeffff } // n = 7, score = 400 // 6804010000 | push 0x104 // 8d85ecfeffff | lea eax, [ebp - 0x114] // c645fc02 | mov byte ptr [ebp - 4], 2 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 8d8decfeffff | lea ecx, [ebp - 0x114] $sequence_4 = { 6a00 6a00 6a00 8d85f0feffff 50 6a00 6a00 } // n = 7, score = 400 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 $sequence_5 = { 52 8d8da4feffff e8???????? 6804010000 8d85ecfeffff c645fc02 } // n = 6, score = 400 // 52 | push edx // 8d8da4feffff | lea ecx, [ebp - 0x15c] // e8???????? | // 6804010000 | push 0x104 // 8d85ecfeffff | lea eax, [ebp - 0x114] // c645fc02 | mov byte ptr [ebp - 4], 2 $sequence_6 = { 8d95bcfeffff c7859cfeffff00000000 0f4395bcfeffff 8bca c785a0feffff0f000000 c6858cfeffff00 8d7101 } // n = 7, score = 400 // 8d95bcfeffff | lea edx, [ebp - 0x144] // c7859cfeffff00000000 | mov dword ptr [ebp - 0x164], 0 // 0f4395bcfeffff | cmovae edx, dword ptr [ebp - 0x144] // 8bca | mov ecx, edx // c785a0feffff0f000000 | mov dword ptr [ebp - 0x160], 0xf // c6858cfeffff00 | mov byte ptr [ebp - 0x174], 0 // 8d7101 | lea esi, [ecx + 1] $sequence_7 = { c785b8fdffff00000000 0f1000 0f1185a4fdffff f30f7e4010 660fd685b4fdffff c7401000000000 } // n = 6, score = 400 // c785b8fdffff00000000 | mov dword ptr [ebp - 0x248], 0 // 0f1000 | movups xmm0, xmmword ptr [eax] // 0f1185a4fdffff | movups xmmword ptr [ebp - 0x25c], xmm0 // f30f7e4010 | movq xmm0, qword ptr [eax + 0x10] // 660fd685b4fdffff | movq qword ptr [ebp - 0x24c], xmm0 // c7401000000000 | mov dword ptr [eax + 0x10], 0 $sequence_8 = { 83bda0feffff10 8d8d8cfeffff 56 0f438d8cfeffff } // n = 4, score = 400 // 83bda0feffff10 | cmp dword ptr [ebp - 0x160], 0x10 // 8d8d8cfeffff | lea ecx, [ebp - 0x174] // 56 | push esi // 0f438d8cfeffff | cmovae ecx, dword ptr [ebp - 0x174] $sequence_9 = { 6a00 6800000100 8d85fcfffeff 50 } // n = 4, score = 400 // 6a00 | push 0 // 6800000100 | push 0x10000 // 8d85fcfffeff | lea eax, [ebp - 0x10004] // 50 | push eax condition: 7 of them and filesize < 1073152 }
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